@zaria
Reading this and your posts that you had already provided them these things: Urdu Nikkah Naama copy with seal of the registrar AND Your union council issued Marriage Certificate.... It clearly seems that the visa officer has over looked the seal on the copy that you provided to them. And completely missed the Nadra Marriage Certificate you provided also. I'm not sure why the date field on your Nikkah nama is empty or did that visa officer overlook it and made a mistake.
Write a letter of explanation, with copies of these things again and referencing them in your letter that the seal can be clearly seen and that the marriage certificate is also attached. (Also provide another english translation + certificate of true translation along with this Urdu nikkah nama's notorized photocopy). Goto the union council / Cantonment Board where your nikkah naama was registered... (through some source preferably) and ask them to write to you on their official letter head that your nikkah nama is registered with them and only on the basis of this did they issue you the Marriage Certificate and the that the date of the Nikkah was XYZ.
**This may sound stupid and basic but just to be extra sure: Nikkah Nama and Marriage Certificate (Union Council issued) are 2 separate things.** Also read country specific document requirements for Pakistanis ....for ambundance of Caution.
May be your lawyer screwed up and forgot to send somethings or mixed something up. Dont rule anything out.
Its a PFL (final chance before refusal). Explain as much as you can and provide as much evidence as you can. Take this very seriously and invest all your time in this. Their concern as per this letter:
(1)They cant see the Nikkah Registrar's SEAL (The maulvi sahab who conducted the Nikkah).
(2) The Nikkah Date field is also Blank.
(3) They can't find Nadra Marriage Certificate (Issued by Union Council and not NADRA itself directly) in your file (Marriage Certificate also has the Nikkah date btw).
They want these things to be crystal clear among other things in Pakistani Spousal cases.